Type-writing machine.



A. G. F. KUROWSKI.

TYPE WRITING MACHINE.

APPLICATION FILED IAN" I4 1913.

Patented July 11, 1916.

erases.

ALFRED F. KUROWSKI, OF BROOKLYN, NEW YORK, ASSIGNOR TO UNDER'W'OOI) TYPE- WRITEB, COMPANY, OF NEW' YORK, N. Y., A. CORPORATION OF DELAWARE.

TYPE-WRITING MACHINE.

mes es.

To aZZ whom it may concern Be it known that l, Anrnnn G. F.'Knnow- SKI, a citizen of the United States, residing in Brooklyn, in the county of lungs, city and State of New York, have invented certain new and useful Improvements in Type- W'riting Machines, of which the following 15 a specification.

This invention relates to linespacing mechanism of typewriting machines, particularly those employing revoluble platens.

The principal object of theinyention 18 to provide improved and simplified means easily applicable to existing-inachlnes and cheaply manufactured, for preventing the platen from being drlven at excessive speed, and to protect the platen and line-spacing mechanism from the objectionable effects of sudden and violent operations of the usual line-space lever or handle which is used on the Underwood or other machines for both rotating the platen and returning the carriage to begin a new line of writin lflxcessive speed or violent or erky operation of the line-spacing" mechanism is ob ectionable because it results in wear and tear of the mechanism; the platen is apt to start ahead of the work-sheet thereon and thereby make the line-spacing uneven; and 1s also apt when being driven at high speed and suddenly arrested to eifect further disarrangement of the work-sheet or Worksheets.

According to my present improvements, a yielding connection is provided between the line-spacing handle and the lever which drives the line-spacing pawl. The handle is preferably placed "upon a slide which is mounted to be driven along the typewriter carriage; and said slide is preferably connectei'lby a coiled spring to the forward end of the line-space lever. The speed of operation of the platen depends not upon the speed of operation of the handle. when the latter is *apidly operated. but upon the strength of the spring; and hence the platen can never turn any faster than' the spring will drive it. Stops are provided for limiting the stroke of the handle and slide; and the usual adj ustahle devices are provided for the line-spacing pawl, for regulating the line-spacing movement of the platen.

Otherfeatures and advantages will here matter appear.

Specification of Letters Patent.

Iatented July 11, 1316.

Application filed January 14, 1918. Serial No. 741,911.

In the accompanying. drawings, Figure l is a perspective view of an Underwood platen and its appurtenances, showing my pr sent improvements applied thereto. Fig. 2 is a cross section illustrating the line-space wheel and pawl.

Fig. 4 IS a plan of parts seen atFig. i

Fig. 3 is a front elevation of the line-space handle andits slide.

In the usual Underwood type of machine A to which my invention is shown applied. the platen 1 is fixed on an axle 2 journaledin the ends 3 (only oneof whichis shown) of a platen frame 4: supported on a carriage 5.

-The platen 1 is rotated by means of a hell crank 6, the arm 7 of which engages and drives rearwardly a slide 8, carrying apawl 9 to engage a ratchet wheel 10 fixed to the platen axle A. stop ll is formed on the platen frame 4 to arrest the pawl 9- after turning of the platen. If the pawl were driven back against the stop 11 too violently, the stop would become battered and hence the pawl would be liable to. travel too far, producing thereby a faulty action of the line-space mechanism. when the platen is started rapidly into'rd tation, it gets started in udvance of the work-sheet held frictiona'lly against the surface of the said plateinbv means ofthe feed rolls13. To avoid these difficulties. 1 have devised improved means, whereby only the required amount of power can be applied to the line-spacing mechanism.

Mounted slidably upon the front. of the carriage 5 is an operating member for the line-space lever, said member shown as a bar 14, having a horn or handle 15 by means of which said bar may be moved. A spring 16 attached at one end to the bar it connects the same to the bell crank 6. to cause the latter to turn the platen. handle 15 is struck sharply it will distend the spring 16 until the ends of the slots 17 reach the studs 18. the pressure thustransmitted to the carriage causing it to travel in its return movement toward the right. In the meantime, the spring 16 will force the pawl 9 to rotate the platen 1.

The regulation of the line-spacing of the platen is effected by setting a shiftable slide '19, having a ledge 20 upon which the pawl l) rides, in a position which permits said pawl 9 to ride elf the ledge sooner or later to engage and adjust the ratchet attached Furthermore ing above the platen frame 4.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

1Having thus described my invention, I 0 mm:

1. In a typewriter, the combinationpf av line-spacing mechanismcomprising a linespace lever, a pawl operated thereby to rotate the-platen, feed rolls bearing upon said platen and receiving motion therefrom, a member operable to return the carriage, and elastic means between said member and said line-space lever to transmit the required ower to the latter to actuate the line-spacmg mechanism.

2. In a typewriter, the combination of a line-spacing mechanism comprising a line- 'space lever, a pawl operated thereby to rotate the platen, feed rolls bearing upon said platen and receiving motion therefrom, a member to operate said line-space lever, and means to limit the amount of power transmissible from said member to the line-space lever to prevent the platen being started to rotate too rapidly and cause a slip between the platen and the feed rolls.

3. In a typewriter, the combination with a line-spacing mechanism comprising a lever and a pawl operated thereby to rotate the platen, of an operating member, and a spring connecting said member to said line-space lever, said member capable of distending said spring sufficiently to actuate the linespaee mechanism.

4. In a typewriter, the combination of a line-spacing mechanism comprising a linespace lever, a pawl operated thereby to rotate the p\laten, a stop to limit the amount of travel of said pawl, an operating member, and means formi a driving connection from said member ,to said line-space lever and operable to limit the amount of power transmitted to the latter to prevent the pawl striking the stop with nndue torc'e.-

5. In a type\vriting machine, the combination with a traveling carriage and a rotatable platen thereon, of a line-spacing.

mechanism for rotating the platen, a slide on the carriage having a limited movement relative thereto, and elastic means connecting the slide with the line-spacing mechanism and operating to prevent excessive force being applied to said mechanism.

6. The combination, in a typewriting machine, of a traveling carriage and a rotary platen thereon, line-spacing mechanism comprising a line-space lever and a pawl, a slide on the carriage having a limited movement relative thereto in the directiomof the carriage travel, and a coil spring connecting said slide and said line-space lever.

7. The combination, in a typwriting machine, of a traveling carriage, a rotary platen, line-space mechanism, a manual device for returning the carriage and operating said mechanism, and a tension spring extending in the direction of the carriage travel and forming a connection between said .device and said line-space mechanism.

ALFRED G. F. KUROWSKI.

Witnesses:-

. F. E. ALExANpnn, Trrns H. IRONS;

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

